Calendar scrolling lag about wingpanel-indicator-datetime HOT 6 CLOSED

I'm not sure if this is the same issue, but the scrolling is fast for me when I restart wingpanel, and then gets slower over time. Just opening the panel and scrolling up and down on the mouse wheel for a bit increases the delay to around a second, on an i7 desktop.

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Can confirm that. When going fore and back with the arrow buttons the calender always hangs like about one second.

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Taking some measurements it looks like the for loop of Grid.set_range is taking up a lot of time:
https://github.com/elementary/wingpanel-indicator-datetime/blob/master/src/Widgets/calendar/Grid.vala#L99-L126

Looks like that whole is grid is recreated every time.

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Scrolling does not seem to lag now, but, using touchpad scroll at least, is not consistent. The scroll action sometimes changes a month (or more) and sometimes not. Seems to depend on speed of movement.

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@tintou commented on #172:

I'd prefer to wait until we get proper gesture support in the Gtk stack with GtkGesture (something like https://valadoc.org/gtk+-3.0/Gtk.GestureSwipe.html )

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calendar should be consistently more performant now

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